(Bug 3395) Split Recent Comments Page and Move to Routing

Splits recent_comments.bml into two pages: comments/recent and comments/posted.
Changes path to Recent Comments page in navigation panel. Adds a bit of
javascript to handle freezing comments from comments/recent. Changes
commentmanage.js to handle deleting of comments when on a page other than
the journal in which it was posted. Changes javascript for background color
on screened comments to use the class <td class='screened'>.